RULE 408. COMPROMISE AND OFFERS TO COMPROMISE
Evidence of (1) furnishing or offering or promising to
furnish, or (2) accepting or offering or promising to accept a
valuable consideration in compromising or attempting to compromise
a claim which was disputed as to either validity or amount is not
admissible to prove liability for or invalidity of the claim or its
amount. Evidence of conduct or statements made in compromise
negotiations is likewise not admissible. This rule does not
require the exclusion of any evidence otherwise discoverable merely
because it is presented in the course of compromise negotiations.
This rule also does not require exclusion when the evidence is
offered for another purpose, such as proving bias or prejudice of
a witness, negativing a contention of undue delay, or proving an
effort to obstruct a criminal investigation or prosecution.